Biomimetic and biodegradable separator with high modulus and large ionic conductivity enables dendrite-free zinc-ion batteries

Hong Ma, Hongli Chen, Minfeng Chen, Anxin Li, Xiang Han, Dingtao Ma, Peixin Zhang and Jizhang Chen ()
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Hong Ma: Nanjing Forestry University
Hongli Chen: East China University of Science and Technology
Minfeng Chen: Nanjing Forestry University
Anxin Li: Nanjing Forestry University
Xiang Han: Nanjing Forestry University
Dingtao Ma: Shenzhen University
Peixin Zhang: Shenzhen University
Jizhang Chen: Nanjing Forestry University

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract The advancement of aqueous zinc-based batteries is greatly restricted by zinc dendrites. One potential solution to this challenge lies in the employment of high-modulus separators. However, achieving both high modulus and large ionic conductivity in a single separator remains a formidable task. Inspired by the wood architecture, this study breaks this trade-off by designing an anisotropic and biodegradable separator. This design significantly improves the modulus along the oriented direction while simultaneously facilitating fast Zn2+ ion transport through aligned vertical channels. Additionally, this configuration resolves the contradiction between low separator thickness and good dendrite-inhibition capability. These benefits are supported by finite element simulations and comprehensive experimental validation, which also underscore the critical role of modulus enhancement for separators. By employing the anisotropic separator, a prolonged life span is realized for Zn||Zn cells, along with improved cyclability in full batteries. This work presents a strategy for separator modification towards dendrite-free metal batteries.

Date: 2025
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DOI: 10.1038/s41467-025-56325-8

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